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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca07373124f399a901fcde1f0769e40b7a27f9dd406b60442004b270d1799f11' 
  AND token = 'FYQg+STrW2Sy35hNr+83AkZEmBTQ4nsh0mGCyu8+HuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}